My wife has had this exact same issue since 10/09. I'm Summit, so I called Frontier today to see if I can get any action. I was told that the Barclay's liaison would be in tomorrow after 11:30AM MT and that I should call again tomorrow. We feel your pain.

Some relevant URLs:

http://www.flyertalk.com/forum/front...-cc-offer.html

http://www.smartertravel.com/blogs/u...tml?id=3683626